Southwest® flights from St. Louis to Washington, D.C. (Dulles) from $132

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Low fares from St. Louis to Washington, D.C. (Dulles)

$

St. Louis (STL)to

Washington, D.C. (Dulles) (IAD)
Depart: 05/27/2026

One-way

Basic

From
$132
Seen: 7 hrs ago

St. Louis (STL)to

Washington, D.C. (Dulles) (IAD)
Depart: 05/21/2026

One-way

Basic

From
$132
Seen: 2 hrs ago

St. Louis (STL)to

Washington, D.C. (Dulles) (IAD)
Depart: 05/24/2026

One-way

Basic

From
$163
Seen: 15 hrs ago

St. Louis (STL)to

Washington, D.C. (Dulles) (IAD)
Depart: 05/25/2026

One-way

Basic

From
$163
Seen: 15 hrs ago

St. Louis (STL)to

Washington, D.C. (Dulles) (IAD)
Depart: 05/22/2026

One-way

Basic

From
$168
Seen: 18 hrs ago

St. Louis (STL)to

Washington, D.C. (Dulles) (IAD)
Depart: 05/18/2026

One-way

Basic

From
$168
Seen: 13 hrs ago

Looking for more low-fare flights?

Check out the Low Fare Calendar to find a fare that works for you. Just choose the month you want to depart and return, and we’ll show you the best fares available.

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Explore flights from St. Louis to Washington, D.C. (Dulles)

Apr 2026
From$255*
Seen: 5 hrs ago
One Way/Basic
May 2026
From$132*
Seen: 2 hrs ago
One Way/Basic
Jun 2026
No result for this month.
$132
$491
Displaying fares for April-2026
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    • Range$132-$491

    *Fares displayed have been collected within the last 24 hours and may no longer be available at time of booking. Additional fees and charges for optional products and services may apply. Modifying this information may result in a different fare. To find the most updated fare, please visit Southwest.com. Fares listed are Basic, which are subject to additional terms and conditions.

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